Bluehost is a large web host known for its WordPress expertise, variety of “one-stop-shop” services, and bargain prices.
Gravatar is a service for providing globally unique avatars.
Jetpack is a popular WordPress plugin created by Automattic, the people behind WordPress.com.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.